CO2 injection

instead of water or alcohol injection, could someone inject co2 into the intake to cool it down? you wouldn't lose performance because you'd get denser air so there would be the same ammount, if not more, of air. you could use it as an emergency system if your engine started knocking. also it would be cheaper than a water injection system because you could use a nitrous nozzle and a small co2 canester (like 10lbs or something) to last until you found the problem or until you adjusted your boost settings. it wouldn't be used like water where it's a frequently used thing.

instead of water or alcohol injection, could someone inject co2 into the intake to cool it down? you wouldn't lose performance because you'd get denser air so there would be the same ammount, if not more, of air. you could use it as an emergency system if your engine started knocking. also it would be cheaper than a water injection system because you could use a nitrous nozzle and a small co2 canester (like 10lbs or something) to last until you found the problem or until you adjusted your boost settings. it wouldn't be used like water where it's a frequently used thing.

ya know C02 is used to extinguish fires right? :wink:

it extinguishes fires because it surrounds it and doesn't let oxygen get to whatever's burning. if you use it in the intake in small quantities, you should be able to cool it down a bit, enough so that you don't bust an engine.

doesnt work that way, you will just kill performance. Sure it will prevent knocking, because its killing performance.

it robs the engine of oxygen. it is bad to get in your intake.

now if you wanted to be brave you could try O2 injection

i don't particularily like the thought of my intake catching fire when i inject it, or my heads, valves, pistons, cylenders, etc. plus there would be massive detonation.

actually, you might be able to run an engine on just oxygen and say kerosene or diesel. make it a 2 stroke and it injects oxygen and fuel which burn as they're injected and then when the piston reaches the bottom a valve opens for the exhaust. ill have to try it one day.

it doesn't have enough mass to dissipate heat anyways...

Water does. And water turns into steam when its heated. What does the same mass of CO2 turn into when its heated?

true true, i was just trying to think of an inexpensive way to decrease intake temps in the case of bad knocking w/o knock sensor that was easy to set up. all you would need is a small tank of CO2(cheap) some lines and nozzle from a nitrouse kit(cheap) a solenoid from a nitrous kit and a switch(cheap).

there are companys that make something similar. They put a bulb inside your intake, and when its activated the bulb/radiator, whatever it is, fills with C02 and cools the air that passes over it.

CO2 is used in a coil around the intake as well to cool the intake down, however its perfomrance gains arent all the great. on intercoolers, however, it works wonders :)

They already sell co2 kits to install in your car. I've been selling them for 2 years and it works

design engineering

Cry02 Systems
http://www.designengineering.com/images/products/CryO2%20Hood300.jpgThe CryO² is a revolutionary new, award wining product designed to reduce the temperature of the air/fuel intake charge thus creating power. Through the science of aerodynamics and cryogenics, Design Engineering has developed a system to harness the cryogenic properties of liquid Co² to lower the air/fuel intake charge by up to 60%. The system is modular and can be easily expanded. The CryO² system provides two methods of cooling the air charge and one method of cooling the fuel charge, all utilizing the same burst of liquid Co². Co² is readily available at any welding supply shop or where paintball guns are charged. Welcome to the future of power.

They already sell co2 kits to install in your car. I've been selling them for 2 years and it works

design engineering

Cry02 Systems
http://www.designengineering.com/images/products/CryO2%20Hood300.jpgThe CryO² is a revolutionary new, award wining product designed to reduce the temperature of the air/fuel intake charge thus creating power. Through the science of aerodynamics and cryogenics, Design Engineering has developed a system to harness the cryogenic properties of liquid Co² to lower the air/fuel intake charge by up to 60%. The system is modular and can be easily expanded. The CryO² system provides two methods of cooling the air charge and one method of cooling the fuel charge, all utilizing the same burst of liquid Co². Co² is readily available at any welding supply shop or where paintball guns are charged. Welcome to the future of power.

Were talking about spraying CO2 into the combustion chamber. With the CryO2 system, CO2 is passed into a bulb into the intake where it cools the oncoming air by convection as the air passes by the bulb. As for the fuel charge, you place an extension on the fuel rail thats cooled. Again, CO2 is not sprayed directly into the fuel or the intake for combustion.

CO2 could be used in place of N20, but here's why you don't.

CO2 - 1 Carbon atom and 2 Oxygen atoms

What do you NOT want to build up in your engine? Carbon.

N20 Is used because the Nitrogen molecule is burned as well, and burns clean leaving no residue behind.

Simple explanation for a simple question.

actually, you might be able to run an engine on just oxygen and say kerosene or diesel. make it a 2 stroke and it injects oxygen and fuel which burn as they're injected and then when the piston reaches the bottom a valve opens for the exhaust. ill have to try it one day.

Engines running on LOX (liquid oxygen) have been tested. The idea is quite simple, you cool some of the exhaust and bypass it to the inlet where it is dilluted with oxygen. Was used on some submarines.

Injecting CO2 is a bad idea though. CO2 is inert, it's the final combustion product. Any injection of CO2 will reduce volumetric efficiency and cut engine power. The detonations might end though.

Water injection also decrease volumetric efficiency; some water is turned into vapor before the inlet valve closes. This amount of steam then displaces air and even though the air might be slightly more dense VE goes down. Fuel injection have the same effect, that's why you can get more power from direct injection than indirect injection. Water can however decrease detonation by reducing combustion temperatures/pressures.